. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 182 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 2. Splitting of an Elongated Protoplasmic Body (cord or tubule). We may recognize here two sub-processes: (a) splittiug at the tip, and {b) splitting along the whole length. a. As is well known, nerves grow out as blunt stalks which repeatedly divide at their ends. Paterson has shown that some of the spinal nerves split at the somato-splauchnic angle, as shown in Figure 11. His ('88, *''*!>*.. Fig. 11. Arch. f. Anat., Jahrg. 1887, p. 376) shows in many cases that the spl
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 182 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 2. Splitting of an Elongated Protoplasmic Body (cord or tubule). We may recognize here two sub-processes: (a) splittiug at the tip, and {b) splitting along the whole length. a. As is well known, nerves grow out as blunt stalks which repeatedly divide at their ends. Paterson has shown that some of the spinal nerves split at the somato-splauchnic angle, as shown in Figure 11. His ('88, *''*!>*.. Fig. 11. Arch. f. Anat., Jahrg. 1887, p. 376) shows in many cases that the split- ting takes place where the end of the growing nerve strikes a rigid organ. Thus, he says, when the third branch of the trigeminus strikes Meckel's cartilage, it divides into the ramus lingualis and the ramus mandibnlaris; and when the hypoglossal meets the jugular vein, it divides into its de- scending and lingual branches. The way in which the rigid organs act to produce splitting is thus explained by His. Pre-existing resistant ob- jects may be considered as the " Motivs" of division; for as a nerve Fig. 11. Cross section of a mouse embryo in the lumbar region, sliowing the splitting of the spinal nerve at the upi)er angle of the coelom. After Paterson, '91, Trans. Roy. Soc. London, CLXXXL, Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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